9speed crank 10speed drive train?

Hey all,

I'm currently building up a cross bike for next season and I've got a question with my 1x10 setup.. I'm looking to use an ultegra 6500 crank (9 speed 39t ring) while running sram rival 10 speed shifters, cassette and rd. Why? Because that crank is in the parts bin and I'm hoping to save a few bucks and not have to purchase a new chainring

I'm just wondering how big of a problem will the bigger chinrings on the crankset be since I'll be using a 10speed chain.. I'm thinking it'll be ok since I'll be running it as a single up front (with bashguard) and wont have to worry about shifting compatibility with a front mech.. Or should I just stop being stingy and pick up a 10speed chainring?

Re: 9speed crank 10speed drive train?

Originally Posted by velo_guy

Hey all,

I'm currently building up a cross bike for next season and I've got a question with my 1x10 setup.. I'm looking to use an ultegra 6500 crank (9 speed 39t ring) while running sram rival 10 speed shifters, cassette and rd. Why? Because that crank is in the parts bin and I'm hoping to save a few bucks and not have to purchase a new chainring

I'm just wondering how big of a problem will the bigger chinrings on the crankset be since I'll be using a 10speed chain.. I'm thinking it'll be ok since I'll be running it as a single up front (with bashguard) and wont have to worry about shifting compatibility with a front mech.. Or should I just stop being stingy and pick up a 10speed chainring?

Any help would be great, Thanks.

I have used 9 speed rings with 10 speed mechanisms with no issues. I'm not sure, but the chainring tooth thickness for 9 and 10 speed may be the same.

Re: 9speed crank 10speed drive train?

In my experience (Campy), 9 and 10 teeth are the same thickness. No problem running 10 spd on 9 hardware and for that matter 9 spd on 8 hardware. Problem is 10 spd on 8 hardware. Your 1x10 setup should be ideal, as the only problem I've encountered is occasionally dropping the 10 chain between the 9 chainrings when shifting half-heartedly. That went away when I went to 10 spd chainrings.

Re: 9speed crank 10speed drive train?

The inside width of 3/32" chains (8, 9, 10, and 11 speed, and most other bicycle applications that aren't BMX or track) is always the same. It's just the thickness of the plates that varies. I've run 10s chains on all my bikes regardless of cog count (except 11s) for years with no issues, and I'll be running the new 11s Dura-Ace chain on my 10s mountain bike, just because it's a sweet chain.

Re: 9speed crank 10speed drive train?

Mh...

Don't do it @work, but I used a 10sp Record and 10sp D.A. 7800 on a Mtb 9sp setup, one case suffrebe from chain skating between outer ring and middle, while downshifting. The other case, wouldn't shift well between the rings.
No particular issues on the rear sprockets, but I didn't want to waste time with, so I put back the Sram 9sp, then a Campag C9. Both cases it all went back to good.